“We have one the best systems in the world in terms of coordination between the police with the counter-terrorism units and with the other blue light services, and stepping up to the thresholds when the special forces – SAS and SBS – are brought in.

“They will be the last resort for when it has really gone horrible wrong.”

While the force would not confirm any specific plans for the unit due to operational reasons, a spokeswoman for the force told Daily Star Online they are doing “everything they can to protect the security of London”.

She said: “Security measures and activities are constantly reviewed to reflect where the threats exist and the level of threat we are facing. Our advice to the public all year round is to be alert but not alarmed.”

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NERVE CENTRE: Met Police assured people they are doing 'everything they can' to protect London

The spokeswoman added: "Run, Hide, Tell is the easy-to-remember message that explains what people should do if they are confronted by terrorists:

"Run to a place of safety. This is a far better option than to surrender or negotiate. If there is nowhere to run then hide. It is better to hide than confront.

"Remember to turn your phone to silent and turn off vibrate. Barricade yourself in if you can. Then finally, and only when it is safe to do so, tell by calling police on 999."

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WARNING: US State Department warned travels of a potential festive attack

Mr Geddes told Daily Star Online: “We have a long history of dealing with seasonal attacks – and with dealing with terrorism generally going back in the 1980s.

“The Met will be running overt and covert surveillance around key locations, there will probably be a good strong uniformed presence.”

He added: “There is no such thing as 100% security – but it is true. There possibly will be a promotional campaign seeing keep your eyes open."The vast majority of threats will be intercepted by a member of the public being vigilant, reacting, and calling the counter terrorism hotline.”